<template>
  <header class="navbar">
    <SidebarButton @toggle-sidebar="$emit('toggle-sidebar')" />
    <a :href="$site.themeConfig.logo.link" class="home-link">
      <img v-if="$site.themeConfig.logo.img" class="logo" :src="$withBase($site.themeConfig.logo.img)" :alt="$site.themeConfig.logo.heroText" />
      <!-- <span v-if="$siteTitle" ref="siteName" class="site-name" :class="{ 'can-hide': $site.themeConfig.logo.img }">{{ $siteTitle }}</span> -->
      <span ref="siteName" class="site-name" :class="{ 'can-hide': $site.themeConfig.logo.img }">GG</span>
    </a>
    <div class="links" :style="
				linksWrapMaxWidth
					? {
							'max-width': linksWrapMaxWidth + 'px'
					  }
					: {}
			">
      <AlgoliaSearchBox v-if="isAlgoliaSearch" :options="algolia" />
      <SearchBox v-else-if="$site.themeConfig.search !== false && $page.frontmatter.search !== false" />
      <NavLinks class="can-hide" />
    </div>
  </header>
</template>

<script>
import AlgoliaSearchBox from '@AlgoliaSearchBox';
import SearchBox from '@SearchBox';
import SidebarButton from '@theme/components/SidebarButton.vue';
import NavLinks from '@theme/components/NavLinks.vue';

export default {
  name: 'Navbar',

  components: {
    SidebarButton,
    NavLinks,
    SearchBox,
    AlgoliaSearchBox
  },

  data() {
    return {
      linksWrapMaxWidth: null,
    };
  },

  computed: {
    algolia() {
      return this.$themeLocaleConfig.algolia || this.$site.themeConfig.algolia || {};
    },

    isAlgoliaSearch() {
      return this.algolia && this.algolia.apiKey && this.algolia.indexName;
    }
  },

  mounted() {
    // console.log(this.$site);
    const MOBILE_DESKTOP_BREAKPOINT = 719; // refer to config.styl
    const NAVBAR_VERTICAL_PADDING = parseInt(css(this.$el, 'paddingLeft')) + parseInt(css(this.$el, 'paddingRight'));
    const handleLinksWrapWidth = () => {
      if (document.documentElement.clientWidth < MOBILE_DESKTOP_BREAKPOINT) {
        this.linksWrapMaxWidth = null;
      } else {
        this.linksWrapMaxWidth = this.$el.offsetWidth - NAVBAR_VERTICAL_PADDING - ((this.$refs.siteName && this.$refs.siteName.offsetWidth) || 0);
      }
    };
    handleLinksWrapWidth();
    window.addEventListener('resize', handleLinksWrapWidth, false);
  }
};

function css(el, property) {
  // NOTE: Known bug, will return 'auto' if style value is 'auto'
  const win = el.ownerDocument.defaultView;
  // null means not to return pseudo styles
  return win.getComputedStyle(el, null)[property];
}
</script>

<style lang="stylus">
$navbar-vertical-padding = 0.7rem;
$navbar-horizontal-padding = 1.5rem;

.navbar {
  padding: $navbar-vertical-padding $navbar-horizontal-padding;

  // line-height $navbarHeight - 1.6rem
  a, span, img {
    display: inline-block;
  }

  .home-link-line {
    position: relative;
    margin-right: 10px;

    &::after {
      content: '';
      position: absolute;
      right: 0;
      height: 100%;
      border-right: 1px #eee solid;
    }
  }

  .logo {
    height: $navbarHeight - 1.6rem;
    min-width: $navbarHeight - 1.4rem;
    margin-right: 0.8rem;
    vertical-align: center;
    float: left;
  }

  .site-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: $textColor;
    position: relative;
    line-height: 2rem;
  }

  .links {
    padding-left: 1.5rem;
    box-sizing: border-box;
    background-color: white;
    white-space: nowrap;
    font-size: 0.9rem;
    position: absolute;
    right: $navbar-horizontal-padding;
    top: $navbar-vertical-padding;
    display: flex;

    .search-box {
      flex: 0 0 auto;
      vertical-align: top;
    }
  }
}

@media (max-width: $MQMobile) {
  .navbar {
    padding-left: 4rem;

    .can-hide {
      display: none;
    }

    .links {
      padding-left: 1.5rem;
    }

    .site-name {
      width: calc(100vw - 9.4rem);
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }
  }
}
</style>
